Make White Chocolate Ganache (see recipe below). Set aside.
In a large mixing bowl, whisk together the eggs, half-and-half, sugar, vanilla and ganache (if using).
Add bread slices and soak for at least 1 hour, stirring occasionally.
Preheat oven to 325 degrees. Pour the bread mixture into a lightly greased 4-quart baking dish. Place in oven and bake until set and browned, about 1 hour.
Serve warm with additional ganache or praline sauce. Top with toasted pecans, if using.
For White Chocolate Ganache: In a medium-size, heavy saucepan over medium-high heat, scald the cream. Place white chocolate in a small mixing bowl and add the hot cream. Stir until well-combined and the chocolate has melted. Use 1 cup in the bread pudding and serve remainder warm with the pudding.
For Praline Sauce: In a medium-size, heavy saucepan, melt butter over medium heat. Add brown sugar and stir to combine. Bring to a boil and add cream. Be careful, as mixture may spatter at this point. Stir until mixture is smooth. Serve warm over bread pudding.Makes 12 Source: